INT, BYTE, CHAR, help with maths.

folks,

i off on project.

this needs bit of maths behind , although think have part down, putting in way arduino understands bit difficult.

the sketch far work in progress, don't bombard me "things missing".

i posting here on need define/declare variables as.

now, trying build structures code maybe become better programmer.  knows?

alas code called v1 - version 1.
hsi 1 of sub-routines.  well, now.

it should self explanatory in case:
i have little accelerometer/gyro/thingy sitting there , turn on.

skipping "zero-ing" it, apart in code,  works out how show attitude on led ring.
(from ada fruit , each led addressable, controllable, etc..  led neopixel)

given pitch 0 +90 or 0 -90 calculate how "share" leds values.
there 0 value offset tell program show level.
the other offset if led #1 not @ top.  (not used yet)

roll shall hope same values.

excuse basic way have done now, code said:  basic pitch.

there in lies problem.
0 - 30 1 led, 31 - 60 , 61 - 90 third.
not good.

yes, int() doesn't help.

so if (what seem remember "single precision") able work out if need show 2 led's.
but in arduino lingo?

i "need" -90 +90 range on these 2 axis.

sure can "cheat" , make 0 - 180 , "-90" comes out.
what ever.....

could please me small sticking point?
thanks in advance.

you made far:

code: [select]


int zvo = 3;
int os = 0;
int led_loop = 12;
int ql = led_loop/4;

...

//  basic pitch
int _a1 = (x / (90/ql)) + zvo;
int _a2 = led_loop - _a1;
 
//  basic roll
int _b1 = (y / (90/ql)) + zvo;
int _b2 = led_loop - _b1;


that little it. know 'x' , 'y' are, , don't know range of other variables or stand for. sorry, hope else can more useful.

you can start giving meaningful names, , write in comments (degrees or else).

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